#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>

int main()
{
  int fd = open("./1.txt",O_RDWR | O_CREAT,0644);
  if(fd < 0)
  {
    fprintf(stderr,"./1.txt is open fail\n");
    return -1;
  }
  close(fd);
  return 0;
}
